Armature for dynamo-electric machines



(No Model.)

L. DAPT.

ARMATURE FOR DYNAMO ELECTRIC MACHINES. No. 277,119.

Patented May 8, 1883.

a U an .5 M. .W W.

' UNITED STATES PATENT OFFICE.

LEO DAFT, OF GBEENVILLE, NEW JERSEY.

ARMATURE FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 277,119, dated May 8,1883.

Application filed September 3, 1881. Renewed March 27, 1883. (No model.)

To all whom it may concern Be it known that I, LEO DAF'l, a subject ofthe Queen of England, residing at Greenville, in the county of Hudsonand State of New Jersey, have invented new and useful Improvements inArmatures for Dynamo-Elec- ,ments are connected in series.

tric Machines, of which the following is a specification.

This invent-ion relates to that class of armatures which are composed ofa cylinder of soft iron having insulated copper wire wound thereon insections parallel to its axis.

I The object of my invention is to provide means for saturating each andevery coil of the helix with the same electro-motive force, usuallyconfined to the first layers next to the iron core or cylinder, therebypermitting me to obtain a current of high tension, which materiallyincreases the etiiciency of the armature. This object I attain by theconstruction and arran gementof parts hereinafter descri bed, andillustrated in the accompanying drawings, in which- Figure 1 representsa transverse section. Fig. 2 is a longitudinal section in the plane 00m, Fig. 1, on a smaller scale than the previous figure.

Similar letters indicate corresponding parts.

In the drawings, the letter A designates a cylinder, which is composedof two or more rings, a a, which are fastened together by a series oflongitudinal ribs, 1) I), while in their interior is secured asheet-metal tube, 0, which serves to support a coil, d, of soft-ironwire, thatis wound upon the sheet-metal tube 0, and the outer diameterof which is equal to the outer diameter of the rings a a. The ribs 1) bare so arranged that they form an even number of compartments (1' d,which receive the insulated copper wire c, which is wound parallel tothe axis of the cylinder, either in separate sections for each pair ofdiametricallyopposite compartments or in one continuous length for allthe compartments, the former method being employed if electricity oflarge quantity and less tension is required-as, for instance, inelectroplating-while for producing high tension the wires of all thecompart- The armature is mounted on a shaft, B, which has its bearingsin spiders C, that are firmly secured to the opposite ends of some ofthe ribs 1) b, and, in order to prevent the copper wire 0, while beingwound, from stopping the passage of the shaft B through the armature,short tubes D are introduced, (see Fig. 2,)which preveutt-he wire 6 fromreaching the center of the armature and allow the shaft to pass freely.

Between the successive layers of the copper wire 0, I place thinmagnetic plates f, preferably made of soft iron. In the example shown inthe drawings these plates are placed be tween the radial layers of thewire, and in this case I provide the same with ledges or feet g, so thateach plate is held in position by the first layer of wire, which restsupon the ledge or foot. Said thin platesfmay, however, be interposedbetween the successive circumferential layers of the wire 0, and in thiscase no ledges are required. The platesf, being composed of magneticsot't'iron plates, act to saturate each andevery coil of the helix withthe same electro-motive force or inductive current, which is usuallyconfined to the first layers next to the iron core or cylinder, therebypermitting me to obtain a current of high tension,-

which obviously renders the armature very efficient.

On the ribs 1) b are secured metal strips E, preferably of soft iron,which form caps exposing a large area of a strongly-magnetic surface, soas to increase the effect of the armature. The sheet-metal tube 0, andalso the ribs 1) b, are perforated, so as to allow the air to circulatethrough the armature and thus prevent overheating.

I am aware that U-shaped copper plates have been attached to anelectro-magnetic armature to receive the coils of the helix for thepurpose of rapidly conveying the heat generated in the helix to thearmature, where it is carried off by a stream of fiowin g water. Such,however, does not constitute my invention, and is not claimed by me.

WhatI claim as new, and desire to secure by Letters Patent, is-- 1. Thecombination, substantially as described, of the magnetic plates-such assoft ir0n--with the coiled wires 0, said magnetic plates beinginterposed between the successivelayers of the wire in the act ofwinding the latter, and serving to saturate each and every layer of thecoil With the inductive current in the manner and for the purpose setforth. v

2. The combination of the rings (0,[1161011- gitudinal connecting-ribsI), forming compartments (1 d, the tube 0, the coil (1 around the tube,the Wire c,wound around the rings. as described, and the magneticplatesf,interposed between the successive layers of the wire 0 andresting on the coil (1, substantially as and for the purpose described.

3. The combination, substantially as here inbefore described, ot' thewire 0, its successive radial layers, and the scparatii'lg-platesprovided with feet or ledges.

4. The combination, substantially as de scribed, of the rings a, thelongitudinal connecting-ribs I), provided With caps E, the tube 0, andthe Wire (1, Wound around the tube, as and for the purpose set forth.

5. The cylinder A, composed of the rings a, the longitudinal ribs 1),connected with the outside of the rings the tube 0, arranged within therings, and the wire (I, coiled around the tube, substantially as and forthe purpose described.

In testimony whereof l havehereunto setmy hand and seal in the presenceof two subscribing witnesses.

\Vitnesses:

W. HAUFF, CHAS. War-mans.

